If several analoge controller mapped to "CarLinearLeft", the max value sinks.
If 2 are mapped the max value is 0.5
If 3 are mapped the max value is 0.33
If 4 are mapped the max value is 0.25
and so on.
Problem is, that the turning circle is lowered and you cannot make smalls turns.
A hotfix is: assign only one analoge controller.